RULE 301. PRESUMPTIONS IN CIVIL ACTIONS AND PROCEEDINGS
In all civil actions and proceedings not otherwise provided
for by statute or by these rules, a presumption imposes on the
party against whom it is directed the burden of going forward with
evidence to rebut or meet the presumption, but does not shift to
such party the burden of proof in the sense of the risk of
nonpersuasion, which remains throughout the trial upon the party on
whom it was originally cast.